Temporal evolution of carriers in a random potential, which are weakly interacting with the acoustic phonon modes, is described by the distribution
\(f_{\alpha t}\)  over the states \(|\alpha )\)  with energies \(\varepsilon _\alpha \) .
An exact with respect to a disordere effect kinetic equation takes the form
[1]}
\(\frac{\partial f_{\alpha t}}{\partial t} = \sum \limits _{\alpha ^{\prime }}\left[W_{\alpha ^{\prime }\alpha }f_{\alpha ^{\prime }t}\left( 1-f_{\alpha t}\right)\right.\nonumber \\\left. -W_{\alpha \alpha ^{\prime }}f_{\alpha t}\left( 1-f_{\alpha ^{\prime }t}\right)\right] .\) 
